Libros de Comunicaciones, página 3 de 160

Commerce requires individual privacy and security--an afterthought in this medium. This volume reviews and explains algorithms and architectures for securing electronic payment systems to deal with this issue, particularly the protocols used for business-to-business commerce and for consumer applications. The continued growth of e-commerce mandates the emergence of new technical standards and methods that will securely integrate online activities with pre-existing infrastructures, laws and processes. Protocols for Secure Electronic Commerce, Second Edition addresses the security portion of this challenge. It is a full compendium of the protocols for securing online commerce and payments, serving as an invaluable resource for students and professionals in the fields of computer science and engineering, IT security, and financial and banking technology. The initial sections provide a broad overview of electronic commerce, money, payment systems, and business-to-business commerce, followed by an examination of well-known protocols (SSL, TLS, WTLS, and SET). The book also explores encryption algorithms and methods, EDI, micropayment, and multiple aspects of digital money. Like its predecessor, this edition is a general analysis that provides many references to more technical resources. It delivers extensive revisions of previous chapters, along with new chapters on electronic commerce in society, new e-commerce systems, and the security of integrated circuit cards.

Learn how to provide seamless, high quality multimedia for the wireless InternetThis book introduces the promising protocols for multimedia services and presents the analytical frameworks for measuring their performance in wireless networks. Furthermore, the book shows how to fine-tune the parameters for Quality of Service (QoS) provisioning in order to illustrate the effect that QoS has upon the stability, integrity and growth of next generation wireless Internet. In addition, the authors provide the tools required to implement this understanding. These tools are particularly useful for design and engineering network architecture and protocols for future wireless Internet. Additionally, the book provides a good overview of wireless networks, while also appealing to network researchers and engineers.Key Features:Provides a comprehensive and analytical understanding of the performance of multimedia services in wireless Internet, and the tools to implement such an understandingAddresses issues such as IEEE 802.11, AIMD/RED (Additive Increase-Multiplicative Decrease/ Random Early Detection), multimedia traffic models, congestion control and random access networksInvestigates the impact of wireless characteristics on QoS constraint multimedia applicationsIncludes a case study on AIMD for multimedia playback applicationsFeatures numerous examples, suggested reading and review questions for each chapterThis book is an invaluable resource for postgraduate students undertaking courses in wireless networks and multimedia services, students studying advanced graduate courses in electrical engineering and computer science, and researchers and engineers in the field of wireless networks.

Written by leading experts in the field, the first edition of WCDMA for UMTS quickly became established as the best-selling and most highly respected book on the air interface of 3G cellular systems. Fully revised and updated the second edition now covers the key features of 3GPP Release ''5 ensuring its position as the leading principal resource in this constantly progressing area. Designed for multimedia communications, WCDMA will create numerous new business opportunities for manufacturers, operators, and content and applications providers. The second edition provides a deep understanding of the WCDMA air interface, its capabilities and its optimal usage - the key to success in the UMTS business, making this practical approach highly accessible to operators, network and terminal manufacturers, service providers, university students and frequency regulators. Explains the key parts of the 3GPP/WCDMA standard and the current status of UMTS licensing Presents network dimensioning and coverage and capacity for WCDMA including capacity upgrade paths and capacity per km2 Introduces radio resource management algorithms and features inter-frequency hand-overs and inter-system hand-overs to GSM Examines the coverage and capacity of WCDMA up to 2Mbps using numerous simulation results and presents antenna diversity gain measurements in the WCDMA experimental system Introduces TDD and discusses its differences from FDD Discusses reference terminal classes Key features of the 2nd edition include: New chapter on High Speed Downlink Packet Access, HSDPA New sections on IP Multimedia Subsystem (IMS) Expanded coverage of: TCP protocol over WCDMApacket channels Base station and mobile performance requirements WCDMA for the Americas - WCDMA1900